Hi
I thought I should note that I've used high speed sampling
scopes several times but that was mostly with a 1GHz+
CPU and an expensive low loading FET probe.
I've only used a logic analyzer twice in 30+ years of
fixing all kinds of electronics. I find them time consuming
and not much good for general debugging. In order to
use one right, you need to have a rough idea as to what
is wrong. By that time, I have been able to narrow it down,
that far, I can quickly trace it with a normal scope. Not saying
there were not times I needed a logic analyzer, it just
that when I did use it, I knew what I was up against.
Both times, it was related to tracing down a design bug
and not just a bad part.
I do beleive that if you are going to get an analog scope,
there is no reason not to get a 100MHz one. They are not
that much more expensive than a 50 or 20MHz one
and there is no penalty in using one. I also recommend
one with a delayed trace. As you get better you'll find
it quite useful.
I should also admit that I do use a DSO for analog work.
I have an old Nicolet with a maximum sample rate of
2MHz. I use it because it has a 12 bit A/D and dual chanel.
I use it for two reasons. Just right for my analog
computer setups.
One is that is has infinite persistance if I want and
I can digitally increase the gain by 64X and watch for
small amounts of drift when setting up intergrators.
Something that would be difficult to do with either
an analog scope or a regular 8 bit sample.
Dwight